http://www.unicode.org/Public/idna/
This public directory contains data files for UTS #46: Unicode IDNA Compatibility Processing.
The directories contain data files associated with a given version of Unicode, such as:
http://www.unicode.org/Public/idna/6.0.0
The data files for the latest approved version are also in the directory:
directory http://www.unicode.org/Public/idna/latest
For more information, including the status of this data, see http://www.unicode.org/reports/tr46/.